mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-26 22:09:35 +00:00
95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
/*
|
|
* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package bytes
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"unsafe"
|
|
)
|
|
|
|
// Raw returns just the bytes without any assumptions about layout
|
|
type Raw interface {
|
|
Raw() *[]byte
|
|
}
|
|
|
|
// Reader used to read various data sizes in the byte array
|
|
type Reader interface {
|
|
Read8(pos int) uint8
|
|
Read16(pos int) uint16
|
|
Read32(pos int) uint32
|
|
Read64(pos int) uint64
|
|
Len() int
|
|
}
|
|
|
|
// Writer used to write various sizes of data in the byte array
|
|
type Writer interface {
|
|
Write8(pos int, value uint8)
|
|
Write16(pos int, value uint16)
|
|
Write32(pos int, value uint32)
|
|
Write64(pos int, value uint64)
|
|
Len() int
|
|
}
|
|
|
|
// Bytes object for manipulating arbitrary byte arrays
|
|
type Bytes interface {
|
|
Raw
|
|
Reader
|
|
Writer
|
|
Slice(offset int, size int) Bytes
|
|
LittleEndian() Bytes
|
|
BigEndian() Bytes
|
|
}
|
|
|
|
var nativeByteOrder binary.ByteOrder
|
|
|
|
func init() {
|
|
buf := [2]byte{}
|
|
*(*uint16)(unsafe.Pointer(&buf[0])) = uint16(0x00FF)
|
|
|
|
switch buf {
|
|
case [2]byte{0xFF, 0x00}:
|
|
nativeByteOrder = binary.LittleEndian
|
|
case [2]byte{0x00, 0xFF}:
|
|
nativeByteOrder = binary.BigEndian
|
|
default:
|
|
panic("Unable to infer byte order")
|
|
}
|
|
}
|
|
|
|
// New raw bytearray
|
|
func New(data *[]byte) Bytes {
|
|
return (*native)(data)
|
|
}
|
|
|
|
// NewLittleEndian little endian ordering of bytes
|
|
func NewLittleEndian(data *[]byte) Bytes {
|
|
if nativeByteOrder == binary.LittleEndian {
|
|
return (*native)(data)
|
|
}
|
|
|
|
return (*swapbo)(data)
|
|
}
|
|
|
|
// NewBigEndian big endian ordering of bytes
|
|
func NewBigEndian(data *[]byte) Bytes {
|
|
if nativeByteOrder == binary.BigEndian {
|
|
return (*native)(data)
|
|
}
|
|
|
|
return (*swapbo)(data)
|
|
}
|